One of the best Thai relationships that I ever experienced was with a lovely lady who came to me on TF. She was looking for a wholesome relationship, not a walking/talking ATM machine. She would never spend my money, in fact sometimes she wouldn't order what I knew she really craved at a restaurant, as she thought it was too expensive. We spent most of my trips together but eventually we drifted apart.
As it relates to the OP's question, she sounds like a quality gal looking for a wholesome relationship. He might be wise to accept her offer and see if the attraction by both is still existent, outside of the confines of her workplace.